<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
<body>
    {% include 'header.html'  %}
        <div class="content">
            这是中间内容部分{{ username }}
        </div>
    {% include 'footer.html' %}
</body>
</html>